Engraving machine



Oct. 24, 1944.

B. PICARD ET AL ENGRAVING MACHINE Filed March 21, 1942 8 Sheets-Sheet l u. II WE--- uuN Oct. 24, 1944. B. PlCARD ETAL ENGRAVING MACHINE Filed March 21, 1942 8 Sheets-Sheet 2 Oct. 24, 1944. RD ETAL 2,361,234v

ENRAyING' MACHINE Filed March 21, 1942 8 Shets-Sheet 5 -Oct. 24, 1944. B. PICARD ETAL V ENGRAVING MACHINE Filed March 21, 1942 8 Sheets-Sheet 4 3011 07/412: card 211 71 1011 lfiald 9 B. PICARD ET AL ENGRAVING MACHINE [Wald 4 Filed March 21, 1942 Oct. 24, 1944.- B. PICARD ET AL 9 ENGRAVIN MACHINE Filed March 21, 1942 8 Sheets-Sheet 6 Oct. 24, 1944.

B. PICARD EI'AL ENGRAVING MACHINE Filed March 21, 1942 v lv g AN Q \Q sign scratched through the varnish is then Patented Octal, 1944 UNITED STATES PATENT OFFICE ENGRAVING MACHINE I Benjamin Plcard and Anthony F. Ward, ,Cranston, R. I.

Application March 21, 1942, Serial No. 435,604

18 Claims. (Cl. 90-245) The present invention relates to an engraving machine and more particularly to a machine adapted to engrave intricate designs directly on the surface of a work-piece.

Although the machine of the present invention may be used for engraving many kinds of work it is particularly adapted for engraving the surfaces of cylindrical rolls used for printing fabrics and similar materials. The best grades of fabric prints are produced by printing rolls having the design hand-engraved on their peripheries. Such hand-engraving is laborious and time consuming so that this method of preparing the printing rolls is too expensive for most uses. The printing rolls usually have the design re peated both around their circumference and longitudinally thereof and to save time and expense a single reverse design is sometimes hand-engraved on a hardened steel hob which is pressed against the periphery of the copper printing roll to transfer the design thereto; the design being repeated both circumferentially and longitudinally of the roll in this manner. While this latter method of preparing printing rolls is less costly than hand-engraving the whole periphery of the roll it is more expensive than the etching process commonly used.

Etched printing rolls are first coated with a varnish which is acid resistant and the design to be etched is scratched through the varnish on the periphery of the rolls by a pantograph etching machine. Pantograph etching machines us.- ually comprise a series of scratching tools corre sponding to the number of repeats in the design to be reproduced. A pattern of the design to be etched is traced by a stylus and through suitable mechanical connecting means the printing roll and tools are moved relatively to scratch the design through the varnish. The roll with the deimmersed in an acid bath which eats out the metal where the varnish is removed to reproduce an intaglio of the design in the periphery of the roll. Due to the liability of chipping the varnish and the undercutting of the edges of the lines by the acid the designis not always reproduced accurately on the periphery of the printing roll and the edges of the design must be sharpened manually with a suitable routing tool. Although etched rolls will not print a design as accurately and satisfactorily as hand-engraved rolls they are used extensively since they may be prepared more expeditiously and at less cost. The etching machines, however, cannot be used to engrave the design directly in the periphery of the printing rolls as the resistance to a series of tools cutting into the work would-be transmitted back to the tracing stylus and prevent free movement of the latter to trace the pattern or the design.

One of the objects of the present invention is to provide a machine for engraving a design directly on the surface of the work-piece by merely tracing the pattern of the design with a manually-operable stylus.

Another object is to provide a machine of the type indicated having power-operated meansv controlled by the movement of the stylus and connected to move the cutting tool and workpiece relatively, one to the other, to engrave a reproduction of the design on the surface of the work-piece as the pattern is traced by the stylus. Another object is to provide a machine of the type indicated with power-operated means for relatively moving the cutting tool and work in two directions at right-angles to each-other.

Another object is to provide a machine of the type indicated embodying a plurality of cutting tools for simultaneously engraving repeats oi the design both longitudinally and circumferentially of a cylindrical work-piece.

Another object is to provide a machine of the type indicated having power-operated means for simultaneously turning the several cutting tools to face them in the direction of the cuts being made as the cutting tools and work-piece are moved relatively in any direction.

Another object is to provide a machine of the type indicated in which the stylus is movable freely in any direction to trace a pattern of a design and rotatable on its axis to face in the direction of the lines of the design being traced.

Another object is to provide a machine of the type indicated having means for transmitting the movement of the stylus to actuate the several power-operated means.

Another object is to provide power means in the machine in the form of servo-motors having freely movable control membersadapted to be operated by the stylus and power-operated pistons which follow the movement of the control members to move the cutting tools and workpiece, one relatively to the other.

Still another object is to provide a machine of the type indicated with electromagnet-operated means for controlling the engagement of the tools with the surface of the work-piece.

Further objects of the invention are set forth in the following specification which describes a preferred form of machine, by way of example,

2 as illustrated by the accompanying drawings. In

the drawings:

Fig. 1 is a front elevational view of an engraving machine incorporating the novel features of the present invention and showing the poweroperated means for sliding the tool-support longitudinally of the work-piece;

Fig. 2 is a plan view of the machine showing the relation of the cutting tools and cylindrical roll or work-piece to be engraved and the poweroperated means for turning the tools to face in the direction of the out being made;

Fig. 3 is an end elevational view of the machine showing the power-operated means for oscillating the work-piece with respect to the cutting tools to engrave around the periphery of the work-piece;

Fig. 4 is a sectional plan view on line ll-4 of Fig. 1 showing the arrangement of the upper and lower carriages for translating any movement of the stylus into two components of movement at right-angles to each other;

Fig. 5 is a transverse sectional view on line 5-5 of Fig. 1 showing the levers which are operated by the movement or the upper and lower carriages to control the separate power means:

Fig. 6 is a detailed plan view showing the motion-reduoing linkage which is operated by the lever connected to the upper carriage to control the power means for relatively moving the cutting tools and work-piece longitudinally;

Fig. i is a transverse sectional view taken generally on line 1-? of Fig. 6 and showing the arrangement by which the tool-support is sli ably mounted on its bed;

Fig. 3 is an enlarged transverse sectional view on line 8--3 of Fig. 1 showing the relationship of the cutting tools to the periphery of the cylindrical work-piece and the electromagnet-opcrating means for controlling the engagement of the cutting tools with the work-piece;

Fig. 9 is a transverse sectional view on line 9-9 of Fig. 2 showing the means operated by the rotation of the stylus for controlling the operation of the power means for simultaneously turning all of the tools to cause them to face in the direction of the cuts being made;

Fig. 10 is an enlarged part-sectional view showing the mandrel for supporting the cylindrical work-piece and the driving means for oscillating the work;

Fig. 11 is a longitudinal sectional view through one of the servo-motors showing the freely movable control valve and power-operated piston for following the motion of the control valve;

Fig. 12 is a diagrammatic view of the outline of a design out in the surface of the work-piece; 4 Fig. 13 is an enlarged transverse sectional view taken on line 13-" of Fig. 12 showing the V- shaped groove cut in the work by the cutting tool;

Fig. 14 is a view similar to Fig. 12 showing a ground-work design cut in the surface of the work-piece; and Fig. 15 is an enlarged sectional view taken on line lB-li of Fig. 14 showing the series of v-shaped grooves cut in the surface of the work to form the ground-work.

Machine in general In' general, the machine incorporating the novel features of the present invention comprises a frame for supporting a table on which the pattern of the design to be engraved is mounted. Overlying the table is a lower carriage mounted on tracks for movement forwardly and rearwardly with respect to the front of the machine. An upper carriage is mounted on tracks on the lower carriage for lateral movement at right-angles to the direction of movement of the lower carriage. A stylus attached to the upper carriage is adapted to be moved manually in any direction to trace the outline of the design to be engraved and such motion is translated by the upper and lower carriages into two components of motion in directions at right-angles to each other. The stylus is also rotatable on its axis to adapt it to face in the direction in which it is moved.

The work-piece to be engraved may be in the form of a cylindrical printing roll adapted to be mounted on a mandrel iournaled in the machine frome. A tool-support positioned adjacent the work-piece mounts a series of tool-posts with cutting tools corresponding to the number 01 repeats of the design to be engraved on the roll. The tool-posts are adjustable with extreme accuracy toward and away from each other and the individual cutting tools are adiustable toward and away from the axis of the work to vary the depth of the cut. Separate power-operated servo-motors are provided which are connected respectively to oscillate the cylindrical work-piece, slide the tool-support longitudinslly of the work-piece and turn the cutting tools to face in the direction in which the cut is to be made. Each of the servo-motors comprises a freely movable control member and a power-operated piston connected to the part to be driven, the power-operated pistons being instantaneously operative to follow the movement of the control member. The control members of two of the servo-motors are connected through motion-reducing mechanism to be actuated by the movement of the upper and lower carriages as the outline of the design is traced by the stylus so as to move the work-piece and tools relatively in two directions at right-angles to each other. The control member of the third servo-motor is arranged to be actuated by the rotation of the stylus on its axis. The machine of the present invention is therefore adapted to cut a reproduction of a selected design directly on the surface of the work-piece as the pattern of the design is traced by the stylus without any resistance to the action of the cutting tools interfering with the free movement of the stylus.

. A manually-controlled electric circuit is also provided in the machine including electromagnets for controlling the simultaneous engagement or disengagement of the several cutting tools with the surface of the work-piece.

" Frame and work-support As illustrated in Fig. 1, the frame of the machine comprises and standards 2 and 3 with to be engraved. The bearing brackets I and I have removable caps l2 and 13 to adapt the mandrel 8 to be removed from the machine so that the work-piece R may be mounted thereon and removed therefrom. The work-piece R is usually mounted on the mandrel 8 at a location remote from the machine and the assembly mounted in the bearing brackets I and 8 to be held inplace by the caps l2 and It. The work piece R is thus mounted in operative position on the machine for rotation about the axis of the mandrel 9.

The mandrel 9 projects beyond the bearing bracket 8 at the right and has an adjusting wheel l5 keyed thereto, see Fig. 10. Also keyed to the projecting portion of the mandrel 8 between the adjusting wheel l5 and bearing bracket 8 is a sleeve I6 provided with a radial flange ll. Mounted on the mandrel 9 adjacent the flange I1 is a driving pulley l8. The pulley I8 is con- I nected to the sleeve l6 for rotation therewith by means of a bolt l9 extending through the flange I1 with its head positioned in an annular T- shaped slot in the side of the pulley. QBy tightening the bolt IS the mandrelB may be connected for rotation with the driving pulley l8; and when the bolt is loosened the mandrel and work-piece may be freed for manual rotation with respect to the pulley to adjust the work-piece in angular relation thereto.

The adjusting wheel 15 has a series of suitable positioning holes 2| disposed around its periphery which correspond to particular angular positions of the work-piece R. A gauging arm 22 rockably mounted adjacent the wheel l5 has a laterally adjustable pin 23 at its end which is adapted to be engaged with any one or the particular holes in the adjusting wheel to set the work-piece R in any particular angular relationship and hold the mandrel t and work-piece accurately positioned while the bolt it is tightened.

Tool-support A tool-support it slidably mounted on the bedplate 6 carries a series of tool-posts 2i corresponding to the number of repeats of the design to be engraved on the cylindrical work-piece Pt longitudinally thereof, see Figs. 1 and 2. The tool-support it is of inverted U-shape in crosssection, see Fig. 5, with a top plate and depending sides which overlie the top and sides of the bed-plate t. Recessed guidewa'ys it are provided in the sides of the bed-plate 6, see Figs. 1 and 5, for receiving rollers 2% which ride on tracks iii and ti formed on the tool-supportiiii and bedplate at the top and bottom of the recessed guideways. The tool-support it is thus mounted to roll on the rollers 2t longitudinally of the bedplate a and the work-piece R.

Referring to Fig. 8, each of the tool-posts it comprises a base 32 adapted to seat on the top of the tool-support 26 with a tongue-and-groove connection to prevent relative turning movement thereof. Bolts 33 on opposite sides of the base it of the tool-posts Ti have their heads positioned in T-shaped slots 3a which extend longitudinally throughout the length of the tool-support it. Nuts 35 on the threaded ends of the bolts 33 are adapted to be tightened to clamp the tool-posts 21 to the tool-support 26; and by loosening the nuts 35 the tool-posts may be accurately adjusted with respect to each other longitudinally of the tool-support. An arcuate guideway 38 projects upwardly from the top of the base 32 of each tool-post for mounting a semicircular bracket or yoke 40. The guideway 38 is formed with arcuate slots M for receiving bolts 42 screwed into the yoke to clamp the latter in various positions of adjustment on the base 32 as indicated by dash lines in Fig; 8. The

opposite ends of the yoke 40 are in the form of bearings 48 for slidably and rotatively mounting tool-holders 44 at opposite sides of the workpiece R.

Each tool-holder 44 comprises a sleeve 45 slidable and rotatable in the bearing 43 and pro vided with a radial flange 46. Slidable longitudinally within the sleeve 45 is a spindle 41 carrying a head 48 at its outer end in which a cutting tool 49 is mounted. The spindle 41 has screw-threads 50 at its rearward end for receiving a nut 5i which abuts the end of a reduced portion of the sleeve 45. The periphery of the nut Si is provided with a series of graduations which are adapted to register with a set mark on the reduced portion of the sleeve 45 whereby to accurately position the forward end of the cutting tool 49 with respect to the periphery of the work-piece R. A relatively stiff helical spring 52 positioned between the head '48 of the adjusting spindle 41 andan abutment within the sleeve 45 tends to hold thenut 5! in engagement with the end of the reduced portion of the sleeve A5 to properly position the cutting tool 49. A lock-nut 53 is provided on the threaded end of the adjusting spindle M for clamping the nut 5i in its position of adjustment. The cutting tool 69 may be of any suitable form, but preferably has a V-shaped end with a clearance rake extending rearwardly from the apex of the tool. By this form of construction each toolpost 271 mounts a pair of cutting tools it arranged at opposite sides of the work-piece R and adapted to be adjusted circumferentially and radially of the latter.

A gear 56 is provided on the sleeve at of the tool-holder it at the right-hand side of the toolpost fit, as viewed in Fig. 8, for turning the cutting tool it to face in the direction of the out being made. The gear 156 meshes with a gear ti on a driven shaft 58 for rotating the tool-holder M in either direction. The pair or tools it on each tool-post 27 are adapted to'be turned'in unison by driving means comprising a sprocket iaii on the driven shaft 58 connected to a sprocket tit at one end of a shaft iii by means of a chain iii. The shaft ti extends across the yoke ti and has asprochet til at its opposite end for driving a sprocket ti on the opposite tool-=holder it by means of a chain tit. Thus any rotary movement of the driven shaft as for turning the cutting tool it at the right-hand side or the ttsohpost 2? will be transmitted through the shaft ii to tool-post.

Pattern tracing mechanism The tracing mechanism as illustrated inl lgs. i and 4 is generally similar to that commonly used in etching machines and well understood by those skilled in the art. Suffice it to state herein that the tracing mechanism comprises a table ii adjustably supported on the cross-strut ii of the frame of the machine and holding the pattern P. having the design to be reproduced. overlying the table ii is a carriage iii mounted to move forwardly and rearwardly of the machine by means of rollers it at its ends which ride on tracks 73 fastened to the inside faces of the upri ht standards 2 and 3 of the frame. A second carriage 75 has rollers '54 adapted to ride on tracks it on the top of the lower carriage iii, the tracks I6 extending at right-angles to the tracks it.

turn the tool at the left-hand side of the adapted for fixedly forwardly from the upper carriage 15 is a stylus 18 for tracing the outline of the design to be reproduced. The arm 11 is pivoted to 9. depending bracket 18 on the upper carriage 18 to adapt the stylus 18 to be lifted off from the pattern. The stylus 18 is journaled in the arm 11 of the upper carriage 15 for rotation on its own axis to adapt it to face in the direction in which the stylus is moved in tracing the design on the pattern. To this end a pair of handles 88 project laterally from the stylus 18 and a hand-wheel 8| is provided abov the handles. In operation the stylus 18 may be guided on the pattern and lifted therefrom either by the handles 88 or the handwheel 8|.

With the carriages 18 and, arranged in the manner described above, movement of the stylus 18 in any direction is translated into component movements of the carriages in two directions at -right-angles to each other. For example, if the stylus 18 is moved from the position shown in Fig. 4 along the line of the diamond shaped pattern P, first forwardly and to the right, the forward component of movement of the stylus will be transmitted through the carriage 18, rollers 14 and track 18 to move the lower carriage forwardly on its rollers 12 a distance equal to the forward movement of the stylus. Simultaneously, the lateral component of movement of the stylus 18 will cause the upper carriage 15 to move on its rollers 14 transversely of the lower car-. riage 18. Attached to the stylus 18 is a flexible cable 82 for transmitting rotary motion to the tools 48 as the stylus is turned on its axis to face in the direction of the lines of the pattern P being traced.

A suitable control and indexing mechanism is illustrated in Fig. 4 for adapting the stylus to be moved obliquely of the pattern P and with a predetermined spacing between its strokes when ground-work is to be engraved. The control mechanism comprises a, pair of pulleys 88 and 88 mounted at opposite ends of the lower carriage 18 with a continuous belt or wire band 81 extending around the pulleys and attached at its ends to a spool 88 mounted on a shaft 84 rotatable on the stylus-support bracket 18. A

pinion gear 88 fast on the pulley 88 meshes with a rack 88 mounted on the standard 8 and extending longitudinally of the end of the lower carriage 18. Mounted on the opposite end of the shaft 88 from the spool 88 is a drum 8| having a series of rows of holes 92 therein adapted to be engaged by a pin 85 depending from an arm 88 pivotally mo1mted on the bracket 18 for the stylus support or arm 11, see Fig. 1. When ground-work is to be engraved the operator turns the drum 8| after each cut a. distance equal to the spacing between adjacent holes 82 in a particular row which, in turn, will cause the spool 88 to be rotated to move the band 81. Such movement of the band 81 will rotate the pulley 88 to travel the pinion 88 on the rack 88 to index the carriages 18 and 18 and stylus 18 forwardly a distance equal to the desired spacing between adjacent cuts. After each adjustment of the drum 8I the pin 85 on the arm 88 is inserted in the appropriate hole 82 and the stylus I" thus will be adjusted to properly space its strokes across the design of the pattern P. Upon movement of the stylus 18 forwardly the gear 88 will travel along the rack 88 to rotate the pulley 88 and move the band 81 longitudinally. When the spool 88 is locked against rotation by the engagement of the pin 88 on the arm 88 with the drum. 8| the movement of the band 81 will act to shift the stylus and upper carriage 18 sidewise as it moves forwardly. It will be understood that each row of holes 82 corresponds" with a ground-work of a particular number of lines per inch and that when an outline only is being traced the rack 88 is swung outwardly away from the pinion 88 so that the stylus may be moved freely in any direction To provide for disconnection of the rack 88 from the pinion 88 the rack is pivoted at its rearward end and held by a catch at its opposite end to adapt it to swing to one side; this being the usual arrangement.

Power means for oscillating the work-piece The forward or rearward component of movement of the stylus 18 while tracing the outline of a design on the pattern P is transmitted from the lower carria e 18 through motion-reducing mechanism to control power means connected to oscillate the cylindrical work-piece R with respect to the cutting. tools 48. As shown in Figs. 1 and 3 the power-operated driving means for oscillating the cylindrical work-piece R. comprises a belt or band 88 extending around the periphery of the pulley I8 on the mandrel 8 and around two loose pulleys 88 and I88 mounted on the upright standard 8 of the machine frame below the mandrel. The terminal portions of the band 88 extend laterally from the pulleys 88 and I88 with their ends attached to a slide IN by adjustable connecting means I82 and I88 thereon. The slide IN is suitably guided on rollers I84 rotatably mounted on studs I85 screwed into blocks formed on the side of the standard 8, see Figs. 1 and 3. The slide I8I has a depending arm I88 connected to the piston-rod I86 of power means I81 attached to the side of the standard I. Movement of the piston-rod I86 in either direction will move the slide I8I therewith and through'the means of the flexible band 88 will turn the cylindrical work-piece R on its axis with respect to the cutting tools48.

Although the power means I81 herein illustrated is in the form of a hydraulically operated servo-motor it is to be understood that any other suitable type of power unit may be used to fall within the scope of the present invention. The servo-motor I81 as illustrated in detail in Fig. 11 comprises a cylinder I88 having heads at its opposite ends and a reciprocable piston H8 in the cylinder connected at one end to the pistonrod I88 extending through one of the heads. A hollow guiding leeve III connected to the opposite end of the piston H8 projects outwardly through the opposite head of the cylinder I89. Connected to the cylinder I88 is a conduit H2 adapted to supply fluid under pressure to the annular chamber H8 between the sleeve I I I and the cylinder I 88. The piston H8 has an inlet port H8 communicating with the chamber H8 and an axial bore H5 in the piston. A second or intermediate port H8 in the piston communicates with the bore H5 in spaced relation to the inlet port H4 and extends to the right-hand end of the piston, as viewed in Fig. 11. Another exhaust port H1 communicates with the bore H8 in spaced relation to the port H6 and leads back to the center of the hollow sleeve I I I. A flexible exhaust conduit H8 connected to the sleeve III adjacent its outer end communicates with the hollow center thereof. Within the bore H5 of the piston H8 is a piston-type valve H8 having a central reduced or ported portion I28 adapted to slightly overlap the inlet and exhaust ports I I 4 and H1. A control rod I2I connected to the movement of the control rod I2I to the left, as

viewed in Fig.'11, the piston-valve 9 will be' moved to open the inlet port II 4 and close the exhaust port ill to a further extent so that the pressure fluid will pass through the intermediate port II6 to the end of the piston H0. The pressure fluid acting against the right-hand end of the piston IIO, as shOWn in Fig. 11, will move the latter and the piston-rod I06 in the same direction or to the left and to the same extent,

as the movement of the control rod. The slide IOI, see Fig. 3, being connected to the piston IIO will be moved to the right as viewed in this latter view showing the motor in reversed position. Due to the continuous pressure of the fluid in the motor the piston IIO will be operated substantially simultaneously with the. movement of the control rod I2I.

Upon movement of the control rod I2I to the right, as viewed in Fig. 11, the piston-valve H9 will close the inlet port I I I and open the exhaust port I I1 so that the pressure fluid acting against the left-hand end of the piston IIO between the 1 sleeve III and wall of the cylinder I09 will move the piston IIO to the right. Thus, movement of the control rod I2I in either direction will cause a corresponding movement of the piston H which, acting through the slide IN, and band 08 will transmit correlated rotary movement to the cylindrical work-piece R. Moreover, due to the balanced pressures acting on the piston-valve II9 the latter may be moved freely by the control rod HI and the piston-rod I06 will follow the movement of the control rod with a force corresponding to the pressure of the fluid and the area of the piston acted upon by the fluid.

The movement of the control rod I 2| of the power-operating servo-motor I01 is controlled by the forward and rearward movement of the carriage 10 operating through motion-reducing mechanism illustrated in Figs. 1 and 3. lower carriage 10 is connected to one end of a lever I25 by means of a link I26, see Fig. 5. The lever I25 is fast on a rock-shaft I21 suitably journaled on the frame of the machine and having a crank-arm I28. The crank-arm I28, in turn, is connected by a link I3I to a crank-arm I 29 extending from a rock-shaft I30 journaled in the standard'3 of the machine frame. A crank-arm I at the opposite end of the rock shaft I30 carries a pin I32 which is adapted to slide in a slot I33 in a bracket I34 fastened to and depending from a horizontal push rod I35. The pi I32 is adjustable longitudinally of the crank-arm I00 to alter the effective length of the latter and the lower end of the bracket I 34 is held against lateral displacement by a suitable guideway I at the bottom of the standard 3. The push rod I35 is mounted on a roller I36 on the arm I08 depending from the slide II and a roller I31 on an arm I30 depending from the sleeve III of the servo-motor I01. An arm I39 at the outer end of the push rodl35 connects the latter to the control rod I2I of the servomotor I01. By this form of construction any movement of the stylus 18 forwardly or rearwardly across the pattern P of the design to he The traced will be transmitted through the lower carriage 10 and the motion-reducing linkage to operate the push rod I2I of the servo-motor I01 with a correspondingly proportional movement.

Power means for moving the tool-support The tool-support 26 is adapted to be moved longitudinally of th work-piece R during any lateral movement of the stylus 18 by means of power-operated driving means similar to that 'described above for oscillating the work-piece.

carriage 15 is a lever I46 suitably connected to a vertical shaft I66 at its rearward end and having a depending truck I II swiveled thereto at its forward end with a pair of wheels mounted thereon to adapt them to ride in the track I M, see. Fig. 5. Lateral movement of the carriage 16 will rock the lever I45 and shaft M6 to the positions indicated by dash lines in Fig. 4. Referring to Figs. 6 and 7, a crank-arm M0 fastened to the shaft M6 is connected by a link M9 to one arm of a bell-cranklever I50 to rock the latter on its pivot I5I to the positions indicated by dash lines in Fig. 6. A pin I52, preferably mounted for adjustment longitudinally of the opposite arm of the bell-crank lever I50, engages in a slot I53 in a bracket I54 mounted fast on a push rod I50, the outer end of the bracket I54 being supported on a suitable guide track IGI. The push-rod I55 is connected by an arm I56 to the. control rod I51 of a servo-motor I53 which may be of identical construction with that of the servo-motor I01 previously described.

Asv shown in Fig. 1 the servo-motor I 58 is mounted on the under side of the bed-plate 0 and has its piston-rod I59 connected to an arm I60 depending from the tool-support 26. The

motion-reducing mechanism connecting the upit is traced by the stylus 18.

Power means for rotating the cutting tools The several cutting tools 40 are turned simul taneous rotation by being made in accordance with the rotation of the stylus 10 as it traces the design on the pattern P. The driving means for rotating the cutting tools 49 is mounted on a rail I 55 adapted for vertical adjustment on rods I66, see Figs. 2, 3 and 9. The rods I66 project upwardly from brackets I61 attached to the rearward sides of the standards 2 and 3 of the machine frame. Bearings I68 on the rail I65 embrace the rods I66 to adapt it to be raised and lowered by means of screw-shaftsi69 rotatably mounted in brackets I64 at the upper ends of the rods I66 and extending through threaded holes in the rail. The screw-shafts I69 are connected for simulmeans of a transverse shaft I10 having bevel-gears I1I thereon which mesh with bevel-gears I12 on the ends of the shafts. The shaft I10 may be turned by means of a design of the pattern P as' crank, not shown herein, fitted to the squared end of the shaft.

Fixedly mounted on the rearward side of the rail I88 is a servo-motor I13 of a construction identical with that of the servo-motor I81 previously described in detail. The piston-rod I14 of the servo-motor I13 has an arm I18 at its end attached to a rack I18 extending longitudinally of the rail I88. The rack I18 is mounted in a suitable guideway I11 in the rail I88. see Fig. 9, and meshes with a series of pinion gears I18 mounted on shafts I88 Journaled in the rail, the number of shafts corresponding to the number of tool-posts 21. The pinion shafts I88 are connected to the driven shafts 88 on the toolposts 21 by means of horizontal shafts I18 having universal joints at both ends. Consequently, the sliding movement of the rack I18 in either direction will act to rotate the cutting tools 48; it being understood that the rail I88 may be raised or lowered by the screw-shafts I88 to locate it in proper relation to the tool-post yoke 48 in its difierent positions of angular adjustment, indicated by dash lines in Fig. 8.

The operation of the servo-motor I13 is controlled from the rotation of the stylus 18 by means of the flexible cable 82, referred to previously, connected thereto. The flexible cable 82 extends upwardly and rearwardly from the stylus 18 to the rail I88, see Figs. 1 and 3, and has its end lournaled in a depending portion I88 of the cylinder of the servo-motor I13 as shown in Fig. 9. A pinion I88 fast on the end of the flexible cable 82 meshes with a rack I81 slidably guided in the depending portion I88 of the cylinder of the servo-motor I18. The rack I81 extends longitudinally of the servo-motor I13 and has an arm I88 at its end, see Figs. 2 and 9, connected to the control rod I88 of the servo-motor. By these connections the rotation of the stylus 18 on its axis will be transmitted through the flexible cable 82 to slide the rack I81 and control rod I88 of the servo-motor I13 to cause the piston-rod -I14 to slide the tool-operating rack I18. Movement of the rack I18 in either direction will rotate the pinion gears I18, shafts I88 and connected shafts I18 extending toward the too1-posts21. The shafts I18 thus will act to rotate the shafts 88 and gears 88 and 81 to turn the cutting tools 48 at the right-hand side of the work-piece 48, as viewed in Fig. 8, to face them in the direction of the out being made. Rotation of the driven shafts 88 will be transmitted through the sprockets 88 and 88, chains 82, shafts 8|, sprockets 83 and 84 and chains 88 to simultaneously rotate the cutting tools 48 at the left-hand side oi. the work-pieceR, as viewed in Fig. 8.

Mechanism for controlling the position of the cutting tools The several cutting tools 48 are adapted to be engaged in unison with the work-piece R or to be withdrawn simultaneously from engagement ,therewith. To this end the yoke 48 of each toolone arm of a bell-crank lever I84 while the opposite arm is forked at I88 to embrace the flange 48 on its respective tool-holder 44. The outward movement of the armature I83 is limited by the engagement of the bell-crank lever I 84 with a stop I88 on the tool-post bearing 43. When the bellcrank lever I84 is in engagement with the stop I88 the tool-holder 44 will have been moved to a position to engage the cutting tool 48 with the periphery of the work-piece R and cause it to cut into the surface thereof to a predetermined depth as controlled by the adjustment of the micrometer nut 8I. When the electromagnet I82 is deenergized a spring I81, acting between the tool-post bearing 43 and the bell-crank lever I84, will rock the latter in a direction to withdraw the toolholder 44 and disengage the cutting tool 48 from the surface of the work-piece R.

Referring to Fig. 3, the energization of the electromagnets I82 is controlled by an electric circuit having one line conductor I88 connected to one terminal of each electromagnet I82 and the other line conductor I88 connected to the other terminal of each electromagnet. The conductor I88 includes a switch 288 of any suitable construction which may be operated manually to energize the electromagnets to move the tools 48 into engagement with the periphery of the workpiece R. A line switch "I also may be provided in the conductor I88 for opening the circuit to the electromagnets when the machine is not in use. Preferably the switch 288 is operated by a suitable foot-treadle, not herein shown, which is normally operative to close the switch 288 to maintain the electromagnets energized and opens the switch when depressed. One form of the invention having now been described in detail the mode of op- .eration of the machine is as next explained.

Mode 0] operation The machine is prepared for an engraving operation by applying a suitable work-piece or printing roll R on the mandrel 8 and mounting the mandrel for rotation in the bearing brackets 1 and 8. The range of action of the motion-reducing connecting means between the stylus-18 and the servo-motors I81 and I88 is then regulated by adjusting the pin I82 on the arm I48, see Figs. 1 and 3, and the pin I82 on the arm of the bell-crank lever I88, see Figs. 6 and '1, to produce equal reductions of the movement of the stylus in two directions so as to accurately reproduce in miniature the design traced by the stylus. The yokes 48 are adjusted on the toolposts 21 to properly position the cutting tools 48 circumferentially of the work-piece and the toolposts are adjusted along the tool-support 28 in proper spaced relation to each other longitudinally of the work-piece R to produce the desired number of repeats in the design to engrave them in series. The rail I88 at the rear of the workpiece R is adjusted vertically by turning the shaft I18 to position the drive shafts I88 on the rail approximately in line with the driven shafts 88 on the tool-posts 21. The tool-holders 44 are also adjusted radially of the work-piece R by turning the adjusting nuts 8| so that all the cutting tools 48 will incise-the surface of the work-piece to the same depth.

The pattern P with the design to be traced may be located in proper position .on the table H and tacked or otherwise. suitably fastened in place thereon. To properly position the pattern P the stylus 18 is moved to locate the cutting tools 48 in their correct position with respect to the workpiece R corresponding to a starting point on the design to be engraved. The corresponding point of the pattern P is then located under the stylus I8 with itsrearward edge in parallel relation to suitable lines usually marked on the table and extending parallel to the axis of the work-piece R. The pattern P is then fastened to the table II and the machine is ready for operation.

The operator of the machine first closes the switch 200, see Fig. 3, to cause the plurality of cutting tools 49 to be moved into cutting engagement with the periphery of the work-piece R. The contour of the design is traced by moving the stylus I8 manually to follow the outline thereof as the operator of the machine turns the stylus on its axis to cause it to face in the direction of the lines. For example, if a design in the shape of a diamond is to be traced, see Fig. 4, the operator of the machine moves the stylus It in a straight line forwardly and to the right from the rearward apex of the diamond-pattern with the point of the stylus facing in the direction of the line. As the stylus I8 is moved along the diagonal line of the design on the pattern P its forward component of movement is transmitted from the upper carriage I5 connected thereto, see Fig. 5, to the lower carriage I by the lateral engagement of the rollers I4 on the upper carriage with the tracks I6 on the lower carriage. The forward movement of the lower carriage I0 as its rollers It travel on the tracksflii is transmitted through the motion-reducing mechanism comprising the link I25 connecting the carriage to the lever I25, see Figs. 1 and 3, to rock the rock-shaft I2I on which the lever is mounted in counterclockwise direction as viewed in Fig. 3. Rocking movement of the shaft I2'I in counterclockwise direction will rock the crank-arm I28 thereon from the position indicated by dash lines to that shown in full lines in Fig. 3. The crank-arm I28 thus will act through the link I3I to rock the crank-arm I29 and rock-shaft I30 to move the crank-arm I00 from the position indicated by dash lines to the position illustrated in full lines in Fig. 3. The pin I32 on the crank-arm I40, actingagainst the sides of the slot I33 in the bracket I34, will move the latter and the push rod I35 connected thereto to the right as viewed in Fig. 3. Movement of the push rod I35 to theright will move the control rod I2I in the same direction and the latter will shift the piston-valve II9 to close the exhaust port I II in the servo-motor I01. Consequently, power will be applied to the piston IIO to move its rod I06 to the right. The slide IIII connected to the piston-rod I06 thus will be moved to the right to cause the band 98 to rotate the pulley I8 in clockwise direction, as viewed in Fig. 3, and with it the work-piece R.

Simultaneously with the clockwise rotary movement of the work-piece R the lateral or side-' wise component of movement of the stylus I8 will be transmitted to the upper carriage I connected thereto to move it to the right, as viewed in Figs. 1 and 4, with the upper. carriage traveling on the tracks I6 of the lower carriage I0. This lastmentioned movement of the carriage I5 to the right will be transmitted to the lever arm I45, see Fig. 4, by the engagement of its depending truck I4I with the track I44 on the upper carriage 15. The rocking movement of the lever arm I45 will rock the shaft I46 on which it is mounted, see Figs. 6 and 'I, and the latter acting through the crank-arm I48 and link I49 will rock the bell-crank lever I50 on its pivot I5I. The engagement of the pin I52 on the lever I50 with the sides of the slot I53 in the bracket I54 will act to move the latter from the position illustrated in full line to the position indicated by dash lines in Fig. 6. Movement of the bracket I54 to the right as viewed in Fig. 6 will move the push rod I55 therewith which, in turn, will move the control rod I51 of the servo-motor I58 to the right. Movement of the control rod I51 to the right will apply power to the piston in the motor I to move the piston-rod I59 and slide the tool-support 25 to the right on the bed-plate 5.

The operator of the machine turns the stylus It on its axis to face in the direction of the line being traced and the position of the stylus is transmitted through the flexible cable 52 tothe pinion gear I55, see Figs. 1, 2 and 9, to slide the rack It? longitudinally. Movement of the rack ItiI in either direction will act to move the control rod I59 of the servo-motor H9 which, acting through its piston-rod Il i, will slide the second rack Ht. Movement of the rack IIIi will cause simultaneous rotation of the plurality of pinion gears H8 and drive shafts Iilil which, acting through the connecting shafts I19 will rotate the driven shafts 58 on the tool-posts N. Rotation of the driven shaft 58 on each tool-post 2I will rotate thetool-holder it at the right-hand side of the tool-post as viewed in Fig. 8 by means of the intermeshing gears 56 and 57. The driving means for rotating the tool holders M are so constructed and arranged that rotation of the stylus Iii through 360 will cause a corresponding 360 rotation of the tool-holders. Consequently, the position of the cutting tools 49 on the toolholders 44 at the right-hand side of the tool-post 2I, as viewed in Fig. 8, will correspond at all times with the position of the stylus I8 so that the cutting tools will face in the direction of the out being made. The cutting tools 59 at the left-hand rotation of the stylus Iii on its axis to face in the direction of the out being made.

As all the several cutting tools 49 on the toolposts 21 are maintained in engagement with the periphery of the work-piece R by the action of the solenoids I92 the simultaneous movement of the work-piece and tool-support 26, corresponding to the movement of the stylus I8, will cause a series of V-shaped grooves to be incised in the surface of the work-piece, see Figs. 12 and 13, corresponding in direction and length to the diagonal or other lines on ,the pattern P. The operator of the machine continues to follow the outline of the design to be traced with the stylus I8 and the latter, acting through the motion-reducing mechanism, as described above, will act to control the power-operated servo-motors I01 and I58 to oscillate the work-piece R and slide the tool-support 26 to reproduce the contour of the design. As the control rods I2I and I5! of the servo-motors I01 and I58 and piston-valves II9 connected thereto are freely movable the resist- .ance caused by the cutting engagement of the plurality of tools 49 with the work-piece R will not be transmitted back to the stylus 18 so that the latter may be moved freely to trace the outline of the design. I

After the outline of the design has been traced or when it is desired to move the stylus I8 to a new position the switch 209 may be opened, see Fig. 3, to deenergize the electromagnets I92. The springs |9'|, see Fig. 8, will then operate on the bell-crank levers I94 mounted on the yokes 40 of the plurality of tool-posts 21 to retract the tool-holders 44 and withdraw the cutting tools 49 from engagement with the periphery of the workpiece R. The stylus 19 then may be moved to any position without causing the tools to out into the periphery of the work-piece R.

When a design to be engraved has both an outline and ground-work it is the usual practice to first engrave the outline on the work-piece R, see Figs. 12 and 13, and thereafter engrave the ground-work, see Figs. 14 and 15. In some designs such as polka dots the entire engraving operation is ground-work. Although the groundwork pattern is illustrated in Figs. 14 and 15 as having the same diamond shape as the design traced in outline, it is to be understood that with the present machine it is not necessary to engrave the outline of the ground-work on the work-piece. The ground-work may comprise a plurality of diagonal lines arranged in closely adjacent parallel relationship. To adjust the machine for engrav-. ing the ground-work the rack 90 is swung into position to mesh its teeth with the pinion gear 89 on the pulley 86. As previously explained, any forward movement of the stylus 19 therefore will be translated into diagonal movement with respect to the pattern P due to the rotary movement of the gear 89 on the rack 90 and the connection of the pulley 80 with the stylus-supporting arm 19 by means of the band 81. The operator may start at the upper rearward portion of the ground-work design, such a the diamond illustrated in Fig. 4, and draw the stylus forwardly and to the right as its lateral motion is controlled by the band 81, with its stroke terminating at the opposite side of the design. The cutting tools 49 are then withdrawn by opening the switch 200 and the stylus brought back to its initial position. The operator next lifts the arm 93 to withdraw the pin 95 from the drum 9| and then turns the latter a distance equal to the spacing between the adjacent holes 92 of a particular row. Rotation of the drum 9| and spool 89 connected thereto will wind up the band 8'! at one side and un wind it from the opposite side to rotate the pulley 9B and pinion 89 which rolls on the rack 90. By this manual adjustment the lower carriage l0 and upper carriage 15 will be advanced a distance corresponding to the required spacing between the cuts to be made. The operator inserts the pin 95 on the arm 93 in the selected hole 92 on the drum 9i and closes the switch 200 to cause the tools 49 to engage the periphery of the work. The stylus is then moved forwardly again to make the next cut of the ground-work and the same operations are repeated until the whole area selected for the ground 'has been covered. To produce ground-work having any predetermined number of lines per inch a particular row of holes 92 in the periphery of the drum 9| is selected to space the line cuts properly.

After a design pattern has been engraved on the work-piece R and it is desired to repeat the design circumferentially thereof the bolt l9, see Fig. 10, is loosened to permit the mandrel 9 to be rotated with respect to the pulley l9. The mandrel 9 may be turned by the adjusting wheel I! which has the various positioning holes 2| in its periphery corresponding to particular angular relationships between the work-piece and the tools. If a particular design cut on the workpiece R covers 45 of are on its circumference the stylus I9 is brought back to first position before the bolt I9 is loosened, for example the upper left-hand corner of the work, and the pin 23 on the arm 22, see Fig. 10, is inserted in a correspending hole 2| in the adjusting wheel l5. After the bolt I9 is loosened the pin 23 is withdrawn and the adjusting wheel l6 turned to another hole corresponding to 45 of the arc, after which movement the pin is again inserted in a corresponding hole. The mandrel 9 and adjusting wheel I! then will be held by the pin 2| while the bolt I9 is tightened. The machine is then ready to start another engraving operation at the proper circumferential location on the work-piece so that it will register with the previous engraving with the repeats in the design joined to each other.

It will be observed from the foregoing specification that the present invention provides an engraving machine adapted to engrave directly on the surface of the work-piece as the design of the pattern is traced by a stylus. It will be observed also that the present invention provides power means having freely movable control members operated by the stylus, and power-operated elements for relatively moving the work-piece and cutting tools so that the resistance of the cutting tools is not transmitted back to the stylus. It will be observed still further that the invention provides a construction in which the cutting tools are continuously turned to face in the direction of the cut being made to adapt the design to be out directly in the surface-of the work-piece.

While the machine of the present invention is herein shown and described as particularly adapted to engrave on the periphery of cylindrical rolls, it is to be understood that the machine may be adapted for engraving flat surfaces or surfaces of other shapes by mounting the tools and workpiece for relative movement in the same plane.

While only one form of the invention is herein illustrated and described, it is to be understood that modifications may be made in the construction and arrangement of its parts without departing from the spirit or scope of the invention. Therefore, without limiting ourselves in this respect, we claim:

1. In a machine of the type indicated, means for supporting a cylindrical work-piece for oscillation about its longitudinal axis, a cutting tool for engraving a design on the periphery of the cylindrical work-piece, power-operated means for oscillating the cylindrical work-piece relatively of the cutting tool, a second power-operated means for moving the cutting tool longitudinally of the work-piece, a manually-operable stylus for tracing a design on a pattern, and means actuated by the stylus to control the operatlon of the separate power-operated means during movement thereof in right-angular directions whereby to engrave a reproduction of the .design traced by the stylus without resistance to the movement of the latter.-

2. In a machine of the type indicated, means for supporting a cylindrical work-piece for oscillation about its longitudinal axis, means for supporting a plurality of cutting tools to simultaneously engrave a plurality of designs on the periphery of the work-piece, power-operated means for oscillating the work-piece relatively of the cutting tools, power-operated means for moving thetool-supporting means longitudinally of the work-piece, a manually-operable stylus for tracing the design on a pattern, and means actuated by the stylus to control the operation of the separate power-operated means during their movement in right-angular directions whereby to reproduce corresponding relative movement of the work-piece and tool-supporting means.

3. In a machine of the type indicated, a cutting tool for engraving a design on a work-piece,

power-operated means for relatively moving thecutting tool and work-piece in two directions at right-angles to each other, a manually-operable stylus for tracing the design on a pattern, means actuated by the ,stylus to control the power-operated means to relatively move the work-piece and cutting tool to engrave the design traced by the stylus, means for mounting the cutting tool for rotation to face in the direction of the out being made, and means operable during an engraving operation for turning the cutting tool to face in the direction in which the tool is being moved.

4. In a machine of the type indicated, a cutting tool for cutting a groove in a work-piece, poweroperated means for relatively moving the cutting tool and work-piece in two directions at rightangles to each other, a stylus for tracing a design on a pattern, means actuated by the stylus to control the power-operated means to relatively move the work-piece and cutting tool to engrave the design traced by the stylus, and means actuated by the stylus for turning the cutting tool to face in the direction in which the cut is being made in the work-piece.

5. In a machine of the type indicated, a cutting tool for cutting a V-shaped groove in the workpiece, a stylus for tracing a design on a pattern, means operated by the movement of the stylus for relatively moving the tool and work-piece to engrave the design traced by the stylus, said stylus being rotatable to face in the direction of the lines of the design being traced, and poweroperated means responsive to the rotation of the stylus for turning the-cutting tool to cause the latter to face in the direction in which the cut is being made in the work-piece.

6. .In a machine of the type indicated, a cutting tool for engraving a design on a work-piece, power-operated means for relatively moving the cutting tool and .work-piece in two directions at right-angles to each other, a stylus for tracing a design on a pattern, means actuated by the movement of the stylus to control the poweroperated means to relatively move the workpiece and cutting tool to engrave a reproduction of the design, said stylus being rotatable to face in the direction of the lines of the design being traced, and power-operated means responsive to the rotation of the stylus for turning the cutting tool to face in the direction in which the cut is being made.

7. In a machine of the type indicated, a cutting tool for engraving a design on a work-piece, power-operated means for relatively moving the cutting tool and work-piece in one direction, a second power-operated means for relatively moving the cutting tool and work-piece in a direction at right-angles to the direction of movement by the first-mentioned power-operated means, a stylus for tracing the design, means actuated by movement of the stylus to control the operation of the separate power-operated means whereby to engrave the work-piece with a reproduction of the design, said stylus being rotatable to face in the direction of the lines of the design being traced, and power-operated means responsive to the rotation of the stylus for turning the cutting tool to face in the direction in which the cut is being made.

8. In a machine of the type indicated, means for supporting a cylindrical work-piece for oscillation about its longitudinal axis, means for supporting a plurality of cutting tools for simultaneously engraving a plurality of repeat designs on the periphery of the work-piece, power-operated means for oscillating the work-piece relatively of the cutting tools, power-operated means for moving the tool-supporting means longitudinally of the work-piece, a stylus for tracing the design, means actuated by the movement of the stylus to control the operation of the separate poweroperated means whereby to reproduce a corresponding relative movement or the work-piece and tool-supporting means, and electromagnet means for simultaneously controlling the engagement of the plurality of cutting tools with the work-piece.

9. In a machine of the type indicated, a cutting tool for cutting a groove in a work-piece, power-operated means for relatively moving. the two directions at right-angles to each other, a stylus for tracing a design, means actuated by movement of the stylus to control the power-operated ly move the work-piece and grave a reproduction of stylus, said stylus being direction of the lines of power-operated means means to relativecutting tool to enthe design traced by the rotatable to face in the the design being traced, for rotating the tool in accordance with the rotation of the stylus to face the tool in the direction of the out being made,

and electromagnet means for controlling the engagement of the tool with the work.

10. In a machine of the type indicated, means for supporting a cylindrical work-piece for oscillation about its longitudinal axis, means for supporting a plurality of cutting tools for simultaneously cutting grooves in the periphery of the cylindrical work-piece, power-operated means for oscillating the work-piece relatively of the cutting tools, power-operated means for moving the tool-supporting means longitudinally of the workpiece, a stylus for tracing a design, means actuated by the movement of the stylus to control the operation of the power-operated means whereby to engrave a plurality of repeat designs on the periphery of the cylindrical work-piece, said stylus being rotatable to face in the direction of the lines of the design being traced, poweroperated means controlled by the rotation of the stylus for rotating the plurality of tools to face in the direction of the out being made, and electromagnet-operated means for-e controlling the engagement of the several tools with the workpiece.

11. In a machine of the type indicated, a cutting tool for engraving a design on a work-piece, power-operated means for efiecting relative movement between the cutting tool and the surface of the work-piece in any direction, a pattern having a design delineated thereon, a manually-operable stylus for tracing the design on the pattern, means connecting the stylus to control the power-operated means to actuate the cutting tool to cause it to cut a design on the work-piece corresponding to the design on the pattern, and means for adjusting said connecting means to vary the proportion of the design on the work-piece relative to the size of the design on the pattern.

. able stylus for tracing of a cylindrical work-piece, power-operated means for effecting relative movement between the cutting tool and the surface of the work" piece, a pattern held stationary during the relative movement between the cutting tool and work-piece, said pattern having a planar face with a design formed by lines extending in dif ferent directions on its face, a manually-operable stylus for tracing the design on the pattern, and means connecting the stylus to control the power-operated means to effect relative movement in different directions between the work-piece and cutting tool to reproduce the design on the workpiece.

13. In a machine of the type indicated, a cutting tool for engraving a design on a work-piece, a plurality of servo-motors for effecting relative movement between the cutting tool and the surface of the work-piece in any direction, said servo-motors having freely-movable control means and. power-operated means adapted to instantaneously follow the movement of the control means, a pattern having a planar face with lines thereon forming a design, a manually-operthe design on the pattern, and means connecting the stylus to operate the control means for the servo-motors to cause the cutting tool to reproduce the design on the workpiece in any desired proportion to the size of the design on the pattern.

14. In a machine of the type indicated, a, cutting tool for engraving a design on a work-piece,

, a plurality of servo-motors for effecting relative movement between the cutting tool and workpiece in any direction, said servo-motors having freely-movable control means and power-operated means adapted to instantaneously follow the movement of the control means, a pattern having a planar face with lines recessed thereon forming a design, a manually-operable stylus for tracing the design on the pattern, and means operated by the stylus and connected to actuate the control means in any desired proportion to the extent of movement of the stylus to effect relative movement of the tool-holder and work-piece to engrave a design of predetermined size on the latter.

15. In a machine of the type indicated, a cutting tool for engraving a design on the surface of a, work-piece, power-operated means for effecting relative movement between the cutting tool and the surface of the work-piece in one direction, a second power-operated means for effecting movement between the cutting tool and the surface of the work-piece in a direction at right-angles to its direction of movement by the first-mentioned power-operated means, a pattern having a planar face with a design delineated thereon, a manasemsa ually-operable stylus for tracing the design on the pattern, means actuated by the stylus to control the operation of the power-operated means to follow the design traced by the stylus to engrave a reproduction thereof on the work-piece, and means for adjusting the control means to vary the proportion of the design on the work-piece relative to the size of the design on the pattern.

16. In a machine of the type indicated, a cutting tool for engraving a design on a work-piece, means for mounting said tool to adapt it to move into and out of engagement with the surface of the work-piece, power-operated means for causing relative movement between the cutting tool and the surface of the work-piece in any direction, a stationary pattern having a planar face with a design delineated thereon, a manuallyoperable stylus for tracing the design on the pattern, means actuated by the movement of the stylus to control the power-operated means, and separate manually-operable means for controlling the movement of the cutting tool into and out of cutting engagement with the work-piece.

17. In a machine of the type indicated, means for supporting a cylindrical work-piece, poweroperated means for oscillating said work-piece about its longitudinal axis, a cutting tool for engraving a design on the periphery of the workpiece, power-operated means for moving the tool longitudinally of the work-piece, a pattern having a planar face with a design delineated thereon, a manually-operable stylus for tracing the design on the pattern, and means actuated by the movement of the stylus to control the operation of the separate power-operated means to oscillate the work-piece and move the cutting tool whereby to engrave a design on the surface of the work-piece corresponding to the design on the pattern.

18. In a machine of the type indicated, means for supporting a cylindrical work-piece, poweroperated means for oscillating said work-piece about its longitudinal axis', a cutting tool for engraying a design on the periphery of the workpiece, power-operated means for moving the cutting tool longitudinally of the work-piece, a stationary pattern having a planar face with a design delineated thereon, a manually-operable stylus for tracing the design on the pattern, control means for the separate power-operated means, and means connecting the stylus to said control means to effect relative movement between the cutting tool and work-piece in rightangular directions whereby to engrave a design on the work-piece in reproduction of the design on the pattern.

BENJAMIN PICARD. ANTHONY F. WARD. 

